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Help with spring strength question


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I have converted a Benelli Super 90 from a tactical configuration to a rifled slug gun. It went from a 18.75" open sight bbl to a 24" heavy fully rifled slug bbl with a scope drilled and tapped to the reciever. I would say that I added maybe three lbs. to the gun. It misfires all the time and I have done everything I know of to fix it,including adding a "sure cycle" recoil spring unit.


My question is this;do I need a heavier recoil spring than the one that comes with the tactical configuration or "sure cycle"? This gun is about 15 years old. Any advice would be appreciated.

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Originally posted by 69beers:

SRM makes a longer plunger for magnum rounds. It essentially stiffens the spring by compressing it more. It may help. Call Jeff, if you can stomach a conversation with him, and see if he'll send you one.

Thanks for the response. Dealing with "jeff" is not an option.


Thanks anyway.

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